Anti - circulation system of rig

The utility model provides an anti - circulation system of rig, including hose nipple, row's sediment return bend assembly, intake pipe, central sealed tube, the connecting cylinder that admits air, drilling rod connection core pipe the tip of sediment return bend assembly is arranged in the hose nipple installation, arranging sediment return bend assembly and belonging to the other end connection center pipe of holding for hose nipple, the center tube other end is connected to the rear end of rig unit head, the connecting cylinder tee bend structure of admitting air, the one end of the connecting cylinder that admits air be provided with central sealed tube, in addition both ends respectively the jointed rod connect core pipe and intake pipe, central sealed tube is connected to the front end of rig unit head, install the drilling rod connector on the drilling rod connection core pipe to through drilling rod connector jointed rod. The utility model discloses the installation is simple, it is reliable to use,